TNY375-380
TinySwitch-PK
Family
®
Energy-Efficient, Off-Line Switcher With
Enhanced Peak Power Performance
Product Highlights
Lowest System Cost with Enhanced Flexibility
•
Simple ON/OFF control, no loop compensation needed
•
Unique Peak Mode feature extends power range without
increasing transformer size
•
Maximum frequency and current limit boosted at peak loads
•
Selectable current limit through BP/M capacitor value
•
Higher current limit extends maximum power in open frame
•
Lower current limit improves efficiency in enclosed adapters
•
Allows optimum TinySwitch-PK choice by swapping devices
with no other circuit redesign
•
Tight I
2
f parameter tolerance reduces system cost
•
Maximizes MOSFET and magnetics power delivery
•
ON time extension – typically extends low line regulation range/
hold-up time to reduce input bulk capacitance
•
Self-biased: no bias winding required for TNY375-376; winding
required for TNY377-380
•
Frequency jittering reduces EMI filter costs
•
Optimized pin out eases pcb/external heatsinking
•
Quiet source-connected heatsink pins for low EMI
Enhanced Safety and Reliability Features
•
Accurate hysteretic thermal shutdown with automatic recovery
provides complete system level overload protection and
eliminates need for manual reset
•
Auto-restart delivers <3% maximum power in short circuit and
open loop fault conditions
•
Output overvoltage shutdown with optional Zener
•
Line undervoltage detect threshold set using a single resistor
•
Very low component count enhances reliability and enables
single sided printed circuit board layout
•
High bandwidth provides fast turn on with no overshoot and
excellent transient load response
•
Extended creepage between DRAIN and all other pins improves
field reliability
EcoSmart – Extremely Energy Efficient
•
Easily meets all global energy efficiency regulations
•
No-load <170 mW at 265 VAC without bias winding, <60 mW
with bias winding
•
ON/OFF control provides constant efficiency down to very light
loads – ideal for mandatory CEC efficiency regulations and 1 W
PC standby requirements
Applications
•
Applications with high peak-to-continuous power demands –
DVDs, PVRs, active speakers (e.g. PC audio), audio amplifiers,
modems, photo printers
•
Applications with high power demands at startup (large output
capacitance or motor loads) - PC standby, low voltage motor
drives
www.powerint.com
®
AC
IN
+
DC
OUT
D
EN/UV
BP/M
TinySwitch-PK
S
PI-4266-010906
Figure 1.
Typical Peak Power Application.
Output Power Table
230 VAC ± 15%
Product
3
85-265 VAC
Open
Frame
2
11.5 W
15 W
18 W
21.5 W
25 W
28.5 W
Peak
12.5 W
17 W
23 W
27 W
31 W
35 W
Adapter
1
8.5 W
10 W
13 W
16 W
18 W
20 W
Open
Frame
2
15 W
19 W
23.5 W
28 W
32 W
36.5 W
Peak Adapter
1
16.5 W
22 W
28 W
34 W
39 W
45 W
6W
7W
8W
10 W
12 W
14 W
TNY375PN
TNY376PN
TNY377PN
TNY378PN
TNY379PN
TNY380PN
Table 1. Output Power Table.
Notes:
1. Minimum continuous power in a typical non-ventilated enclosed adapter
measured at +50 °C ambient. Use of an external heatsink will increase power
capability.
2. Minimum continuous power in an open frame design (see Key Applications
Considerations).
3. Packages: P: DIP-8C. Lead free only. See Part Ordering Information.
Description
TinySwitch-PK incorporates a 700 V MOSFET, oscillator, high-
voltage switched current source, current limit (user selectable),
and thermal shutdown circuitry. A unique peak mode feature
boosts current limit and frequency for peak load conditions. The
boosted current limit provides the peak output power while the
increased peak mode frequency ensures the transformer can be
sized for continuous load conditions rather than peak power
demands.
May 2007
POWERINT [ POWER INTEGRATIONS, INC. ]
